Ignition device fob liqtjtd-etlel burners



Nov. 6, 1928. 1,69I03 W. W. WILLIAMS IGNITION DEVICE FOR LIQUID FUEL BURNERS Filed Deo. l, 1924 di?? L' APatented Nov. 6, 1928.

UNITED sTATEs WALTER.` w. WILLIAMS, or IsLoonINGrou, ILLINOIS, assIeNon-To WILLIAMS oIL-o- MATIC HEATING CORPORATION, OF BLOOMINGTON,

ILLINOIS.

ILLINOIS, A CORPORATION OF IGNITION DEVICE FOR LIQUID-FUEL BURNERS. l

Application led December 1, 1924. Seri'al No. 753,187.

My invention relates to liuuid fuel burning devices and more particularly to an ignition means'therefor.

The object of my invention is in th'e provlsion of a combined gas supply control and spark device-for'igniting aliquid fuel burnin evice. f

Another obj-ect of my invention is in the v provision of an ignition mechanism for a liquidfuel burning device comprising a mechanically. operating means controlled by the action of the burner for operating simultaneously and temporarily a gas. supply and jump spark circuit.4

A vstill further object of'my invention is in the provision of an ignition mechanism for a fuel burning device comprising an auxiliary independent as suppl o erativel connect- 'ed with the flglgel burning dlevice, andr a sparking device disposed adjacent the discharge end of the burner, said sparking device being energ'zed` temporarily upon the commencement of operation of the burner and acting simultaneously with the gas supply to ignite the discharged fuel mixture.

A further object of my invention is in the provision of a combined gas su ply and spark ignition mechanism for liquidJ fel burners,

wherein the gas 'supply is intimately associated with the burner device, and mechanism adapted to energizethe jump spark circuit upon commencement of operation of the burner and to simultaneously release a determined amou'nt ofgas for the purpose of initially igniting the discharged fuel mixture.

' A still further object of my invention is in the provision of a means for atomizing a fuel mixture, and an ignition mechanism for igniting said fuel mixture includinga combined gas supply and jump spark circuit, said'gas supply beingconnected with the fuel atomizing member and-having a valve member therein controlled simultaneously with the action of the jump spark circuit which is adapted to' operate temporarily upon the commencement of operation of the burner.

Other objects of my invention will appear in the following specifications taken in connection with the'annexed drawings in which Fig. 1 is a vertical view shown partially in section for the purpose of illustrating in detail portions thereof.

Fig. 2 is a plan view of Fig. 1.

device showing diagrammatically the general 11 of said motor forming the power conneci nto the fuel pipe.

Fig. 3-is an enlarged detail of a portion of the ignition control mechanism.

Fig. 4 is a detailed showing partially in section Vof the gas valve.

Fig. 5 isa side elevation of the fuel burning electrical connections.

, Fig. 6 is an enlarged detail of a portion of the fuel burner; and

Fig. 7 is a cross-sectionaliview of the fuel atomlzer.

Referring tothe drawings, I havelshown, in Fig. 5, a general view of a liquid fuel burning device, the same having beendescribed in detail in applicants patent bearing No. 1,451,798.

Although described in detail in said patent, it is thought necessary to describe, at least generally, the main elements and operation of the burner.

An electric motor is shown at 10, the axis tion for the associated portions now to be described.A

Mounted in connection with the electric motor and driven by the axis 11 thereof is an atomizing pump 12, said atomizing pump being` made up of the following elements:

An outer casing is referred to as 13, and a rotor14 is mounted upon .the axisor motor shaft 11 in an eccentric relation tothe casing '13. Sliding vanes 15 are locatedin the rotor 14. Fuel inlet means to the atomizing chamr is shown at 16, as well as an air inlet 17 A fan casing 18'is likewise attached to the electric motor, said fan casing housing a fanmember (not shown). A draft tube 19 houses the blast from the fan which is delivered to the discharge point 20 of the burner. A fuel mixture discharge tube 1s shown at'21 leading from the atomizing chamber to the discharge point or nozzle 20 of the burner. 1 The above description of the general elements of the burner have been given for the purpose of generally describing the burner itselfgthe operation of which is as follows: 100

.Fuel and air are induced into the .atomizing chamber by the action of the rotor, whereby a complete ato'm-izationtakes place, and the resultant mixture discharged through the pipe 21 passing through the nozzle 2O and into 105 the combustion chamber (not shown).

The present application is directed to ignition mechanism associated directly with Fuel burning devices were originallygand,

in some instances, even now ignited by a continuously burning gas pilot light. Progress in the field of fuel burning devices for domestic installation has .advanced beyond this point and, in many instances, the discharged fuel mixture' is ignited now by a spark device. Y

There areinstances where the use of a spark as an ignitionmeans ,is not successful and this mainly when fuel of a low specific gravity is used.

To insure absolute ignition of the -discharged fuel mixture, applicant originally devised a gas supply control wherein a gas pilot was located adjacent the discharge nozzle of the burner and a jump spark was located adjacent thereto in a manner to ignite a determined supply ofrgas issuing therefrom, temporarily, upon the commencement of operation of the burner. The application de scribing such mechanism is now pending and bearsSerial No. 57 8,618, being filed July 31, 1922. The present application. although similar in a great many respects to the application above mentioned, nevertheless, has a different and more successful manner of handling the gas .supply used for ignition purposes.

Referringtothe drawing, in Fig. 2 is disclosed pressure operated mechanism adapted to automatically control .a gas supply and jump spark circuit. A tube 22 connects the atomizing chamber with a `diaphragm member 23 located in a skeleton housing 24. Any rise in pressure within the atomizing chamber is transmitted directly to vthe diaphragm member, the upper and lowegfpositions of which may be noted by the dotted lines shown thereon. 1

The upper side of the diaphragm 23 has a lug 25 located thereon and adapted to oper-` ate a pivoted lever 26 upon expansion of the diaphragm 23. Skeleton frame 24 supports, at one side, a formal dash pot 25, the piston 27 of said dash pot being operatively connected with one lend ofthe lever 26. The

y skeleton frame 24 supports at its opposite side a gas valve made up of the following portions:

A gas inletway 1s shown at V29 andI communicates with the chamber 30 wherein is loi cated a valve member 31, said valve member being tensioned by the coil spring 32 and accordingly held uponv its seat 33. The valve stem 34 projects through theupper side of the chamber-for housing 30 and is slidable therethrough. The lever'26 is pivoted at 35 in a supporting post 36 attached to the frame 24.

As has been described, the lever 26 has one of its ends operatively connected with the piston 27 of the dash pot. However, the opposite end has a peculiar operative connection with the'gas valve, said -action being as follows:

A coil spring 37 connects the valve operating end of the lever 26 with the post 36 and normally tends to hold the lever in a raised position with respect to the gas valve. Pivoted 'to the lever :26 is a valve operating lug 38 fastened in such manner that, upon downward movement of the lever 26 induced by the expansion ofthe diaphragm 23, it will depress the valve 31 for a determined time and, thereafter, release said valveor rather, the stem 34 thereof and assume' the position shown in dotted lines in Fig. 1.

Relative to the operation of the above mechanism, it may be seen that, upon commencement of operation ofthe burner and, hence, movement of the rotor in the atomizer, a pressure will be built up gradually therein.

with the result that a gradual expansion of the diaphragm 23 will directly affect the lever I 26 and, hence, raise it against the retarding action of the dash pot 25. The upward movement of the lever results in the lowering of the valve operating lug 38 and, hence, depresses, or rather opens, the gas valve tem porarily, or better, until the lug 38 moves to the dotted line position shown in Fig. 1 and indicated as 39.

A gas outlet from the chamber 30 is described as 40, said gas outlet leading through valve. also induces a flow of gas thereto.

So'far, nothing has been said relative to I the sparking mechanism which comprises the following elements ,r

A spark coil is shown at 43, said coil being connected in any suitable manner in the electrical circuit of the burner. Electrodes 44. in connection vwith the coil 43, are disposed adjacent the discharge end of the burner and directly in the path of the discharging fuel mixture.

I have described merely a simple jump spark circuit, but it is understood, of course, that any meansfof producing a spark at the point of discharge could be readily used.

a Included in the electrical circuit to the sparking mechanism is electrical connection 45 running to a knife switch 46 upon the gas supply control above mentioned.

frame 24, said knife switch normally receiving the lever 26 when in its lower or inout of the knife switch, hence, opening the circuit in the sparking mechanism and, thereby, resulting in a discontinuance of the spark as an ignition element adjacent the discharge end of the burner.

It is obvious that the action of the gas valve andy sparking as dependent upon the initial movement of the device for their operation.

Perhapsitwould be Well, at this time, to distinguish the 'present vstructure from that of applicants co-pending application forha T e former structure resulted in a temporary delivery of gas from anindependent supply adjacent the discharge end of the burner. The present structure results, not in the mere opening of a valve and the release ofgas temporarily to a point adjacent the discharge end of the burner, but a valve is opened in the auxiliary gas supply anda flow is induced' therethrough by the action of the rotor in the atomizing chamber. The advantage of the latter structure may be illustrated by an actual statement of facts, inasmuch as the ignition of the device flow of gas.

In case the gas pressure is low, a small amount of gas will issue adjacent the discharge end of the burner, that is, of course, with the structure described in the co-pending application. Naturally, the time 0f opening of the gas valve is limited and, hence, with low gas pressure, an insufficient is dependent upon the amount of gas for ignition purposes will issue and, therefore, prevent the ignitionof the discharging fuel mixture Ywhich would throw into operation the safety .controls and, hence, cut out the operation of the burner until service.

device is simultaneous as well With the present structure', no matter what the gas pressure, whether it be high or low, the lactivity of the rotor induces a flow of gas'into the atomizing chamber where it is joined with the fuel mixture and discharged as a part of said mixture. Naturally, the gas loses none of its ignition qualities and is readilyy ignited by the sparking mechanism upon discharge. The fact that it is temporarily part of the fuel mixture merely expedites the ignition of the latter.

The development of the present structure was occasioned directly from instances above described, wherein there was a failure of gas pressure, or a very low pressure, and the disadvantages of the structure described in the above mentioned application were entirely overcome by using the action of the rotor to induce a flow of gas into the atomizing chamber.

What I claim is:

1. In an electrically-operated liquid fuel burner including a Vmotor for supplying liquid fuel to the burner nozzle, electricallyactuated ignition means adjacent the burner nozzle, an auxiliary gas supply connected to the liquid fuel supply means, means for simultaneously operating the fuel supply motor and ignition means and causing said fuelA supply means to deliver the auxiliary gas to the burner nozzle whereupon it is ignited by the ignition means, and means actuated by the accumulated pressure created Within the fuel supply means after initial operation to cut off the auxiliary gas supply and discontinue the operation of the ignition means.

2. In an electrically-operated liquid fuel burner including 'a motor for supplying atomized liquid fuel to the burner nozzle and additional air thereabout, an electrically-actuated ignition means adjacent the burner nozzle', an auxiliary gas supply connected to the liquid fuel atomizing means, means for simultaneously operating the fuel supply motor and ignition means, whereby the auxiliary gas and atomized fuel issuing from the nozzle are ignited, and means actuated by the accumulated pressure created Within the liquid fuel atomizing means after initial operation to cut off the auxiliary gas supply and discontinue the operation of the ignition means.

In. testimony whereof, I have aiiixed my signature.

WALTER W. WILLIAMS. 

